TODENTJ-25-03-2019_TODENTJ-9-409 1553505914 Bentham Open doi@benthamopen.net Bentham Open The Open Dentistry Journal TODENTJ 1874-2106 12 23 2015 9 1 Horieh Moosavi Fatemeh Maleknejad Maryam Forghani Elham Afshari Objectives : This in vitro study evaluated the microtensile bond strength (MTBS) of a methacrylate- based compared to a silorane-based resin composite in Class I cavity using different placement techniques.Materials and Methods: Class I cavities with dimension of (4 mm long, 4 mm wide, 3 mm deep) were prepared in extracted sound human molars. The teeth were randomly divided into six groups. The first three groups were filled with Filtek P90 using three methods of insertion; bulk, incremental and snow-plow, and the remaining three groups were filled with Clearfil AP-X using the same three placement techniques. After 24 hours of storage in water at 37°C, the specimens were thermocycled to 1000 cycles. Specimens were prepared for MTBS testing by creating bonded beams obtained from the pulpal floor. Statistical analysis used: Statistical analyses of data were performed by two-way ANOVA/Tukey (α=.05). Results: The experiment showed significant differences between the two resin composites with regard to filling techniques (P<0.05). The MTBS was significantly higher in each of Filtek P90 subgroup compared to Clearfil AP-X ones (P<0.05). With respect to filling technique in both resin composites, bulk insertion showed the significantly lowest MTBS (P<0.05), while no significant difference was found between the outcome of incremental and snow-plow techniques (P>0.05). Conclusion: Silorane-based resin composite as opposed to methacrylate based resin composite and layering placements in contrast to bulk filling method had higher microtensile bond strength. 12 23 2015 409 413 TODENTJ-9-409 1 10.2174/crossmark_policy opendentistryjournal.com benthamopen.com true Peer Reviewed Single blind Checked with iThenticate 2015-4-21 2015-7-13 2015-10-8 2015-12-23 https://creativecommons.org/licenses/by/4.0/legalcode 10.2174/1874210601509010409 1553505914 https://opendentistryjournal.com/VOLUME/9/PAGE/409/ https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-409/TODENTJ-9-409.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-409/TODENTJ-9-409.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-409/TODENTJ-9-409.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-409/TODENTJ-9-409.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-409/TODENTJ-9-409.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-409/TODENTJ-9-409.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-409/TODENTJ-9-409.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-409/TODENTJ-9-409.xml Dent. 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